IOS枚举学习

ゞ 浴缸里的玫瑰 2022-08-06 11:21 271阅读 0赞 
  1. 枚举就是自己定义的一些常量，而这些常量是根据自己的需要定义不同的用途。 有两种形式定义枚举。代码如下：
  7. #import <Foundation/Foundation.h>
  9. //枚举在ios中一般使用前缀+枚举类型+属性/状态 这样，首字母和单词首字母大写，例如UI+ControlState+Normal
  11. //typedef enum
  12. //{
  13. //    ColorBlack = 0,
  14. //    ColorGreen = 10,
  15. //    ColorBlue = 20,
  16. //    ColorRed       // 没有标明的话，就是递增加 1
  17. //    
  18. //} Color;
  21.  enum Color
  22. {
  23.     ColorBlack = 0,
  24.     ColorGreen = 10,
  25.     ColorBlue = 20,
  26.     ColorRed       // 没有标明的话，就是递增加 1
  28. } ;
  32. @interface EnumStu : NSObject
  34. //@property(nonatomic)  Color color;
  35. @property(nonatomic) enum Color color;
  37. -(void) showEnumMsg;
  38. //-( Color) returnColor;
  39. -(enum Color) returnColor;
  41. @end
  49. #import "EnumStu.h"
  51. @implementation EnumStu
  53. @synthesize color;
  55. -(void)showEnumMsg
  56. {
  58.     NSLog(@"enum--->%u",self.color);
  60. }
  62. //-( Color)returnColor{}
  64. -(enum Color)returnColor
  65. {
  67.     NSLog(@"返回enum--->%u",self.color);
  68.     switch (self.color) {     <p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo; color: rgb(49, 89, 93);"><span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">        case</span><span style="font-variant-ligatures: no-common-ligatures; color: #000000"> </span>ColorBlack<span style="font-variant-ligatures: no-common-ligatures; color: #000000">:</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #3d1d81">NSLog</span>(<span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"---%@"</span>, <span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"</span><span style="font-family: 'Heiti SC Light'; color: rgb(209, 47, 27);">选择了黑色</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">"</span>);</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">break</span>;</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">        <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">case</span> <span style="font-variant-ligatures: no-common-ligatures; color: #31595d">ColorGreen</span>:</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #3d1d81">NSLog</span>(<span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"---%@"</span>, <span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"</span><span style="font-family: 'Heiti SC Light'; color: rgb(209, 47, 27);">选择了绿色</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">"</span>);</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo; min-height: 13px;">           </p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">break</span>;</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">        <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">case</span> <span style="font-variant-ligatures: no-common-ligatures; color: #31595d">ColorBlue</span>:</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #3d1d81">NSLog</span>(<span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"---%@"</span>, <span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"</span><span style="font-family: 'Heiti SC Light'; color: rgb(209, 47, 27);">选择了蓝色</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">"</span>);</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo; min-height: 13px;">            </p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">break</span>;</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">        <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">case</span> <span style="font-variant-ligatures: no-common-ligatures; color: #31595d">ColorRed</span>:</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #3d1d81">NSLog</span>(<span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"---%@"</span>, <span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">@"</span><span style="font-family: 'Heiti SC Light'; color: rgb(209, 47, 27);">选择了红色</span><span style="font-variant-ligatures: no-common-ligatures; color: #d12f1b">"</span>);</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo; min-height: 13px;">           </p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">break</span>;</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">        <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">default</span>:</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo;">            <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2">break</span>;</p><div>
  69. </div>
  70.     }
  71.     return self.color;
  73. }
  75. @end

调用

  1. EnumStu *enumStu = [[EnumStu alloc] init];
  2.         enumStu.color = ColorGreen;
  3.         [enumStu showEnumMsg];
  4.         [enumStu returnColor];

2015-01-19 23:07:26.557 OC**基础学习**[1025:57363] enum—->10

2015-01-19 23:07:26.558 OC**基础学习[1025:57363]返回**enum—->10

2015-01-19 23:07:26.558 OC**基础学习[1025:57363] —-选择了绿色**

Program ended with exit code: 0

  1.     简单调用和定义。

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